The Supreme Court (at least in the USA) is the final arbitrator of cases. Cases are submitted to the Supreme Court in order to correct errors in judgment for the lower courts; even traffic tickets can go to the US Supreme Court, although it is highly unlikely because the Supreme Court has jurisdiction to take the appeal only if the appeal involves a federal question of some sort. The US Supreme Court has no jurisdiction over matters that are purely state related. Errors in judgment can cover a wide array of things (much too long to answer here).

The Supreme Court.

The correct name is the Supreme Court of the United States, but most people refer to it as the US Supreme Court. Each state has its own Supreme Court, but the US Supreme Court is the end of the line.

(Supreme Court)

The US Supreme Court is the highest court in the US. Each state has its own Supreme Court, but the US Supreme Court is the end of the line.